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<head><meta charset="utf-8"><title>What&#x27;s the deal with stabilizing Fn* · general · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/122651-general/index.html">general</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/122651-general/topic/What&#x27;s.20the.20deal.20with.20stabilizing.20Fn*.html">What&#x27;s the deal with stabilizing Fn*</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122651-general/topic/What%27s%20the%20deal%20with%20stabilizing%20Fn%2A/near/225705069" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jake Goulding <a href="https://rust-lang.github.io/zulip_archive/stream/122651-general/topic/What&#x27;s.20the.20deal.20with.20stabilizing.20Fn*.html#225705069">(Feb 09 2021 at 15:20)</a>:</h4>
<p>3.5 years ago, <a href="https://github.com/rust-lang/rust/issues/29625#issuecomment-240585954">nagisa said</a>:</p>
<blockquote>
<p>uncertainty about <code>Args</code> being the right thing given the possibility of variadic generics coming along around 2030 is the most major reason this is unstable.</p>
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<p>And <a href="https://github.com/rust-lang/rust/issues/29625#issuecomment-242929622">aturon said</a>:</p>
<blockquote>
<p>also possibly some questions around the inheritance relationship, see <a href="https://github.com/rust-lang/rust/issues/19032">#19032</a></p>
</blockquote>
<p>Are these still the main concerns preventing stabilization of this feature?</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122651-general/topic/What%27s%20the%20deal%20with%20stabilizing%20Fn%2A/near/225705478" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Steven Fackler <a href="https://rust-lang.github.io/zulip_archive/stream/122651-general/topic/What&#x27;s.20the.20deal.20with.20stabilizing.20Fn*.html#225705478">(Feb 09 2021 at 15:23)</a>:</h4>
<p>Yep</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122651-general/topic/What%27s%20the%20deal%20with%20stabilizing%20Fn%2A/near/225705634" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Steven Fackler <a href="https://rust-lang.github.io/zulip_archive/stream/122651-general/topic/What&#x27;s.20the.20deal.20with.20stabilizing.20Fn*.html#225705634">(Feb 09 2021 at 15:24)</a>:</h4>
<p>also the special "rust-call" ABI</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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